I'm so sorry to hear about your great-grandma Shannon
I have to admit that when my own grandmother was in a nursing home that I never went to visit her either. She had gotten a little senile and didn't always know who was who. It was just to hard to go and have her get confused and I wanted to remember her
when she was better. Guilt is an awful thing to bear, and I bet she would be very upset that you are feeling this way. I'm sure she knew exactly how much you loved her and appreciated her.
Again my deepest sympathy to you...........Joan